Keyless entry system

专利名称：Keyless entry system

发明人：Nakajima, Satoshi c/o Alps Electric Co., Ltd.

c/o Alps Electric Co., Ltd.,Hayasaka, Satoshic/o Alps Electric Co., Ltd.

申请号：EP08006399.3申请日：20080331公开号：EP1982876A2公开日：20081022

专利附图：

摘要：A keyless entry system is provided includes a vehicle-side device and a portabledevice. The vehicle-side device includes a vehicle-side transmission unit installed in a

vehicle and connected to plural transmission antennas transmitting a request signal viasignal lines, and a vehicle-side reception unit receiving an answer signal. The portabledevice includes a portable device-side reception unit receiving the request signal, and aportable device-side transmission unit transmitting the answer signal. The vehicle-sidedevice includes a vehicle-side control unit that performs a pre-determined control whenthe answer signal from the portable device is authenticated. The portable device includesa portable device-side control unit that detects the intensity of the signals transmittedfrom the plural transmission antennas. The vehicle-side control unit or the portabledevice-side control unit calculates distances between the portable device and therespective transmission antennas based on data of the intensity of the signals

transmitted from the plural transmission antennas detected by the portable device-sidecontrol unit. When an added value of the distances calculated based on two of theintensity data is smaller than a predetermined threshold value, it is determined that theportable device is located inside the vehicle.

申请人：Alps Electric Co., Ltd.

地址：1-7 Yukigaya-Otsuka-cho Ota-ku Tokyo 145-8501 JP

国籍：JP

代理机构：Klunker . Schmitt-Nilson . Hirsch

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